Magnetization plateau in a two-dimensional multiple-spin exchange model

Details Magnetization plateau in a two-dimensional multiple-spin exchange model Magnetization plateau in a two-dimensional multiple-spin exchange model

1998-10-09

arxiv.org/abs/cond-mat/9810118v2

Phys. Rev. B 59, 9491 (1999)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, RevTeX, 12 figures, added a reference and corrected typos, to be published in Phys.Rev.B (01 APR 99)

Scientific paper

10.1103/PhysRevB.59.9491

We study a multiple-spin exchange model on a triangular lattice, which is a possible model for low-density solid 3He films. Due to strong competitions between ferromagnetic three-spin exchange and antiferromagnetic four-spin one, the ground states are highly degenerate in the classical limit. At least 2^{L/2}-fold degeneracy exists on the L*L triangular lattice except for the SO(3) symmetry. In the magnetization process, we found a plateau at m/m_{sat}=1/2, in which the ground state is "uuud state" (a collinear state with four sublattices). The 1/2-plateau appears due to the strong four-spin exchange interaction. This plateau survives against both quantum and thermal fluctuations. Under a magnetic field which realizes the "uuud" ordered state, a phase transition occurs at a finite temperature. We predict that low-density solid 3He thin films may show the 1/2-plateau in the magnetization process. Experimental observation of the plateau will verify strength of the four-spin exchange. It is also discussed that this magnetization plateau can be understood as an insulating-conducting transition in a particle picture.

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